anyone know how much boost a stock turbo from a MCS puts out?

 

.8 bar, or approx 11.6 psi.

 

cool thanks

 

it also appears that the turbo kicks in stronger in certain gears ..i.e. I think from 2nd to 3rd gear is more boost than 1st to 2nd.

(that's what I've noticed on my boost guage).

 

def i can feel the diffrence from 2nd to 3rd

 

it depends on teh year of ur car and what software version is has

07's with early software had the most boost

ask me how i know? the dealer updated my car without me asking

and now it's a dog :(

 

I've seen nothing documented about a difference based on what gear you're in. You're probably feeling the overboost function, which allows brief periods of extended boost when you stand on the throttle.

 

Hey all, just "FYI" on forced induction engines.
Look at it like: The engine is an air pump... air in / air out, the more air moving through the engine - the more power the engine makes. "Boost" is a measurement of air that the engine cannot "Process", hence the amount of air (pressure) that is "backed up" on the intake side of the engine.
The gearing in the drivetrain in the lower gears allows for the engine to race through the RPM range to redline and processing the maximum amount of air -thus - all the air that the turbo is feeding the engine in that short time frame being processed - less back up of air in the intake = less boost but same amount of air.
As you get to the higher gears - the RPM at full throttle climbs slowly... so the SAME VOLUME OF AIR (i'm simplifying) that was going through the engine in the lower gears cannot pass through the engine in the higher gears = a backup of air going into the engine = boost. So the more "LOAD" you put on the engine (which is equal to putting so much strain on the engine that it cannot advance in RPM at full throttle) = the more boost you make. less load in the lower gears = less boost. The turbo is working correctly the whole time.
Sorry so long winded!

 

On a side note, there is no talk on the forums about people doing a boost leak test. Along with a boost leak test, I would change all the pressure pipe clamps from the factory screw clamps to t-bolt clamps.

 

just to update this thread

I went and dynoed my car today.. pulling the boost info from the OBD port and logging it on the dyno

it was a flat 12psi all the way.. no spikes or drops at all

I NEED MORE BOOST :(